Catch push_sub/pop_sub errors
Description
This MR modifies the regression test perl script to capture errors about non-matchin push_sub/pop_sub pairs. This is currently checked with the on-demand debug_trace
builder.
News snippet
Catch push_sub/pop_sub errors
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.